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0. H. JOHNSN MILL Filed July '7, 1925 INVENTOR l 4 ATToRNEm.

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Patented Oct. 12, .1935.

UNITED STATES PATENT QEFQE.

@SCAR H. JOHNSON, F DENVER, COLORADO, ASSIGNOR TO TEE MINE AND SMEL'IER SUPELY COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

MILL.

Application :filed July 7,

This invention relates to an improvement in rod mills, that is to say, to an improvement in mills tor reducing ores, cement, and the like, employing a rotary elongated or cylindrical drum or shell containing loose, freely movable elongated reducing bodies or rods.

Among the objects oi' my invention is the provision of a mill of the type just referred to, in which I employ an improved guard plate at the discharge end of the mill, this plate being ot such a construction and so arranged that repairs, renewals, etc. may be easily ellected.

In the drawings accompanying this application I have shown two embodiments of my invention Fig. 1 being a part sectional elevational view ot one form of my invention;

Fig. 2 being an end view, partly in section, of the discharge end of the mill of Il 1; while Fig. 3 is a vfragmentary sectional elevational view of a moditied form of mill.

Referring to the drawings in detail, 1 designates a rotary elongated cylindrical shell, drum or barrel provided with sectional wall liners 2 constitutingl or providing the reducing compartment 3 et the mill. This drum is mounted at the leed end in a feed trunnion bearing ll, while adjacent the other end I provide the mill drum with a` tire 5 resting upon rollers (l.

7 designates a feed hopper and 3 a screw or screw conveyor by which material fed into the hopper 7 is carried forward into the red ucing compartment of' the mill through the leed trunnion 1l. The periphery ot the drum and the `feed head 9 of the mill are provided with manholes 10 and 11, respectively, aiiording access to the interior of the drum tor effecting repairs, renewals, or tor any other purpose, it being understood that the mill may be re-rodded, re-lined, or any other repairs or renewals made thereto through these manholes.

"lhe discharge end ot the mill is provided with a truste conical hell 12 bolted or otherwise secured to the body of the shell. Bolted to this bell and lying` within the plane thereot is a discharge plate 13, provided with a central truste-conical discharge opening 141. Across this opening I provide a bar or web l5, to which is bolted a truste-conical plug or tiller 16 the base et which faces the img.

rior of the mill. Writhin the bell 12 aforesaid and slightly spaced from the wall liners 2 I provide a sectional imperliorate guard plate 17, this plate being assembled about the plug or filler 16. rlfhe plug 16 is hexagonal or noncircular in plan and beveled the fr edges 18 ot the several sections 19 of the guard plate being correspondingly beveled or inclined, so that the several sections et the guard plate which are bolted to the discharge plate 13 will prevent turning the plug, the bolt 2O in turn preventing rearward movement of the plug, while the plug itself provides a partial support for and assists in maintaining the sections of the guard plate in place. Between the front face ol' the guard plate and the inner tace oit the discharge plate 13, I provide litters 2l secured in place by the same bolts which hold the guard plate in position. o

The rear tace oit the guard pla-te 17, that is to say, the side facing or adjacent the crushing compartment 3 or' the mill, is concave, as indicated at 22, the periphery ot this concave portion oi the plate extending beyond the inner edge or tace Q3 of the wall liners 2. This prevents the rods from striking the edge ot the guard plate when the mill is in operation and also prevents the rods trom becoming caught between the guard plate and the ends of the liners.

In the operation of the mill, the material which has been reduced by the rods in the reducing compartment 3 passes through the space left between the edge of the guard plate 17 and the inner face of the bell 12, by reason of the guard plate which exten-ds transversely oli' the mill being of smaller diameter than the mill, flows into the lifter compartment, where it is raised by the litters 21 and finally is discharged through the discharge opening 14 in the discharge plate.

In making repairs or effecting renewals to the interior of the mill, access may be had to the reducing compartment through the manhole 10, for example, and inasmuch as the guard plate 17 and the wall liners`3 are made in sections, these parts may be taken out through the manhole and repaired or replaced with new parts, as desired. The mill may be re-rodded through the manholes 10 and 11 and bentor worn out rodsA may be removed and replaced through these same openings.

In the forni ot my invention illustrated in vbeinglined with Wall'linersfo. ,The feed .end of this mill has not been illustrated,

but it isl to beunderstood that it is similar in all essential respectsy to ythe feed end of Vthe'mill'ofFig. l.' The periphery of the mill drum` is 4 provided .with a gear "26, by which lthe'ldrum may be rotated. The forward or dischargeend of this mill isr'frusto-reonical,

as: indicated .at 27,v ands provided With a 'dis'ohargebell or plate 28bolted lorother- Wise securedto the frusto-conical end of lthe mill 1drum.'T0this bell v28,1 boltV a guard 'plate 29'.i :This guardlplate is made in sections jand -is providedfwith a central cone, plugor'fi'ller 30,'heir'agonal, for instance, the setting'up of the -nuts on the bolts 3l by which the yseveral.sections of the guard plate are held lin place 'also'securely fixing this c'onein'position. The guard plate29, which cxtendstransversely of the mill, isk of smaller diameterth'an the interior of the mill. The 'bell 28V is provided Withlifters 32, by which the material as it discharges Out of the reducing chamber 33 of the mill is lifted and .allowed to HOW out through the vdischarge trunnion 84C, thecone 30 being concave, as .indicated atu, so as to provide a passage- Way 36 vfrom the lifter compartment to the trunnion 34. Thetrunnion 34 may be` made of any size desired andthe cone 3,() may Abe Y ,provided with a central Aopening" 37,' this Y be necessary for desirable;

opening affording means for renewing the' ,grinding bodies in the drum Aofthe mill'hthis opening being large enough to permit of the Arods being passe-d through the same tothe interior of the mill. The opening thedischarge plate or hell 28 and that in'tlie'trun-v nionl 34 are in constant communicationnwith eachother. 'lt is to beunderstood, of course, that'V the periphery of this Ymill will he provided With a" manhole suchas the l'maialiole 8 of'Fig. l for permitting a Workman lto enter tl e mill for the purposes Vof renewing the Wall liners, renewing the[.sectionsfof" the ssld' plat@ 28, Or fdr the'puriwse'omaking anv other repairs or renejvgtlg'tliat may The rear facie .df #the guard plate 2S/and' @if *Cli plee '3.0 er@ 'Cantare es indicated aras,

' ivill vdesignate 39, enten-ding beyond the ledge plate are assembled.

providing a vreducing con so as to prevent the reducing;rods from becoming caught between theV guard plate and the end of the mill or the end of the Wall liners.

lil/vliet l claim' i f l. A mill comprising a rotary drum, shell Vor barrel, a sectional imperforate guard plate adjacentthe discharge end of the mill, and acentral 'plug or iiller member about which ,the sections Aof the sectional guard y2 l`ln 'a mill comprising arrotary drum apartment, loose, freely movable reducing bodies in saidcom- A partm en't, yan imperforate sectional yguard plate at the discharge'end of said compartiment, and a central ping or filler member providing y a partial, support Afor the sections of fr saidsectional guarddplate Y 3. mill comprisinga rotary drum, shell or barrel, Y ausectional Y guard plate adjacent the diecharge lend et' :the Amill and spaced from the Walls thereof, and acentral frustoconical .plugor filler member, the base Yof which faces the interior offsaid druinand about which the sections of saidguard plate are assembled.

4. A millcoinprising a rotary drum having a frusto-conical formation ,adjacent its discharge end, and avsectionall; guard plate lying Within the plane ofthe said frustoconical portion of the mill and'having its periphery spaced therefrom to provide a discharge opening for the mill.

.5. A millco'mprising a rotary drum, sectional liners for the interior of vthe drum, aguard plateextending transversely of the mill and mounted adjacent the discharge end thereof and having its periphery spaced from the drum Wall, -the face of said plate adjacent the interior of the drum ybeing of larger diameter than the vinterior of thef drum.

6. it. mill comprising a rotary drum, Wall liners for said drum,a frusto-conical guard plate across the drumadjacent the discharge end thereof, the base of Vsaid cone facing toward they discharge end of the mill, the opposite face of said plate being concaved, the 4diameter of said concaved portion eX- ,ceeding theinside -diameter ofthe mill drum Aadjacent the innerface of the plate.

7. A mill comprising a rotary elongated drum or barrel, an imperforate guard plate adjacent the discharge end ofthe said drum, thefinside vdiameter'of the mill drum at the plate @Xceeding the diameter ofthe plate to providea discharge slot! between the 'drum andgua'rdplate, adischarge plate Sat the end of the drum provided With a discharge opening, and litters intermediate said guard plate 1and said dischargeplate-for eecting the transferer flow ofmateriahafter it has passed thelsaid discharge slot, cthrough said discharge opening. Y

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reoaase 8. A mill comprising a rotary drum or shell, a discharge plate provided with a discharge opening attached to the discharge end ot the drum, a ectional guard plate attached to said discharge plate, and a central plug or liller member about which the sections of said guard plate are assembled attached to said discharge. plate.

9. ln a mill, a rotary drum, a plate having a discharge opening therein attached to said drum and extending transversely thereoi, a guard plate Within the drum, and spaced from the Walls thereof, to provide a discharge slot tor the passage of material from the interior of the drum to said discharge opening, said pla-te being composed ot sections or sectors disposed about a central plug or tiller, and a member eX- tending across said discharge opening to which said plug is attached.

lO. ln a mill, a rotary drum, a discharge head or plate attached to the discharge end of the drum, and provided with a discharge opening, a discharge trunnion adjacent said head and constantly7 in communication With the opening in said head, a guard plate ot' smaller diameter than the interior of the rotary drum and ext-ending transversely of the drum, said plate being made in sections, a ce tral plug about which said sections are assembled, litters between the guard plate and discharge head, said head, litters and plate being attached to each other.

ll. In a mill a rotary drum, a guard plate attached to the mill adjacent the discharge end thereof, said plate comprising a plurality of sections and a central plug or iiller about Which the several sections ot the plate are assembled, said plug or liller being provided With an opening extending there` through for the purpose set r'orth.

This specification signed this 25 day of June 1925.

OSCAR H. JOHNSON. 

